XML 59 R34.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Intangible Assets - Narrative (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2024 USD ($) county | Dec. 31, 2023 USD ($) county | Mar. 31, 2024 USD ($)
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Impairment | $ 0 | $ 0 |  | $ 0 | $ 0 |
Broadband licenses granted, number of counties | county |  |  |  | 20 | 24 |
Exchanges - licenses received |  |  |  | $ 23,838,000 | $ 41,250,000 |
Licenses exchanged |  |  |  | 2,992,000 | 8,215,000 |
Gain on disposal of intangible assets, net | (20,753,000) | (13,737,000) |  | (20,846,000) | (33,035,000) |
Sale of intangible assets |  |  |  | 0 | 25,427,000 |
Gain on disposal of intangible assets | 0 | 32,000 |  | 0 | 7,364,000 |
Deferred gain on sale of intangible assets | $ 4,911,000 |  |  | 4,911,000 |  | $ 4,911,000
SDG&E | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Delivery delay adjustments |  |  | $ 1,100,000 |  |  |
Licensing Agreements |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Exchanges - licenses received |  |  |  | 23,800,000 | 41,300,000 |
Licenses exchanged |  |  |  | $ 3,000,000.0 | $ 8,200,000 |
Sale of intangible assets |  | 700,000 | 44,000,000 |  |  |
Reduction of intangible assets |  | 600,000 | 31,800,000 |  |  |
Gain on disposal of intangible assets |  | $ 32,000 | $ 7,300,000 |  |  |

X
- Definition Broadband Licenses Granted, Number of Counties + References No definition available. + Details
Name: | atex_BroadbandLicensesGrantedNumberOfCounties
Namespace Prefix: | atex_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Collaborative Arrangement, Rights And Obligations, Delivery Delay Adjustments + References No definition available. + Details
Name: | atex_CollaborativeArrangementRightsAndObligationsDeliveryDelayAdjustments
Namespace Prefix: | atex_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Deferred Gain On Sale Of Intangible Assets, Cumulative + References No definition available. + Details
Name: | atex_DeferredGainOnSaleOfIntangibleAssetsCumulative
Namespace Prefix: | atex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Gain From Disposal Of Intangible Assets + References No definition available. + Details
Name: | atex_GainFromDisposalOfIntangibleAssets
Namespace Prefix: | atex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Gain On Sale Of Intangible Assets + References No definition available. + Details
Name: | atex_GainOnSaleOfIntangibleAssets
Namespace Prefix: | atex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Indefinitelived Intangible Assets, Exchanged Licenses Received + References No definition available. + Details
Name: | atex_IndefinitelivedIntangibleAssetsExchangedLicensesReceived
Namespace Prefix: | atex_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Indefinitelived Intangible Assets, Exchanged Licenses Surrendered + References No definition available. + Details
Name: | atex_IndefinitelivedIntangibleAssetsExchangedLicensesSurrendered
Namespace Prefix: | atex_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-1 + Details
Name: | us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482686/350-30-45-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-3 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
Name: | us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase (decrease) of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 + Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsPeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash inflow from disposal of asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 12 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-12 + Details
Name: | us-gaap_ProceedsFromSaleOfIntangibleAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | srt_CounterpartyNameAxis=atex_SanDiegoGasElectricCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DeferredRevenueArrangementTypeAxis=us-gaap_CollaborativeArrangementTransactionWithPartyToCollaborativeArrangementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_LicensingAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |